This is a GREAT resource; just listen for the beacons:
http://www.ncdxf.org/pages/beacons.htmlBut my very first suggestion is the same as WN2C. Call CQ a few times! Happens all the time--a band sounds dead, you call a few times, and someone replies out of the blue. Last year 15meters sounded dead, before dawn, driving to work, and a ZL came back to my CQ. :-) How fun is *that*? ;-)